Poweshiek County, Iowa · Frost dates
Poweshiek County frost dates.
First-frost, last-frost, and growing-season length for Poweshiek County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-17
- 20%
- 05-13
- 50%
- 05-03
- 80%
- 04-24
- 90%
- 04-19
First fall frost
- 10%
- 09-22
- 20%
- 09-27
- 50%
- 10-06
- 80%
- 10-15
- 90%
- 10-20
28°F — killing freeze
Last spring freeze
- 10%
- 05-09
- 20%
- 05-04
- 50%
- 04-23
- 80%
- 04-14
- 90%
- 04-09
First fall freeze
- 10%
- 10-01
- 20%
- 10-07
- 50%
- 10-17
- 80%
- 10-25
- 90%
- 10-29
Growing season length (days, 28°F threshold)
- Short year
- 145
- Median
- 177
- Long year
- 203
Source NOAA station
GRINNELL 3 SW, IA US
11.9 mi · 30 yrs of record (1991–2020) · 905 ft elev.
Data from GRINNELL 3 SW, IA US, 11.9 miles away with 30-year NOAA record (1991-2020).
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